Sony SDX-900V Series, Технические характеристики

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6.Command Specification MODE SELECT
6-40 SONY AIT-4 drive SDX-900V series Ver.2.1
Mode Fixed Bit in Read, Write Block Length in
Mode Select/Sense
Fixed Block
Variable Block 1
0 Block Size
0
The default fixed block size is 0 bytes however, if a fixed command (fixed bit of ONE) is received, the drive will return
the CHECK CONDITION status with an ILLEGAL REQUEST sense key and the additional sense code shall be set
to COMMAND SEQUENCE ERROR.
Note: Minimum block-size is 4. The figures must be multiples of 4, otherwise CHECK CONDITION status will be
return, and Sense Key will be ILLEGAL REQUEST.
Following the Block Descriptor are the MODE SELECT pages. They are the method by which the device parameters
are set. Each page has a two byte header which identifies the page code and indicates the number of bytes in that
page.
Table 6-38: MODE SELECT Page Header
Bit
Byte
7 6 5 4 3 2 1 0
0 PS Reserved Page Code
1 Additional Page Length
PS: when the Page Savable bit is set, this indicates that the page contains saved parameters. This bit will never be
set as there is no non-volatile RAM on the drive into which parameter data may be saved.
The page codes that are supported are:
Table 6-39: Supported MODE SELECT Page Codes
Page Code Description
00h
02h
0Ah
0Fh
10h
11h
1Ch
31h
32h
33h
3Fh
Standard Sense
Disconnect-Reconnect
Control Mode Page
Data Compression Control
Device Configuration
Medium Partitions Parameter
Information Exception Control
AIT Device Configuration
Append Partition (not support)
Delete Partition (not support)
Return All Pages
Additional Page Length: Indicates the number of bytes in that page. The value does not, however, include bytes 0
and 1. The length is returned on MODE SENSE and must subsequently be set to the same value when performing
MODE SELECT.
If the page length does not match that expected by the drive a CHECK CONDITION status is returned with the sense
key to set to ILLEGAL REQUEST.
The drive also returns a CHECK CONDITION status with an ILLEGAL REQUEST sense key if the Host sends an
unsupported Page Code, a page field with values that are not supported or are not changeable. In this case, no
parameters will have been changed by the command.